Liquid Crystal Display Panel Black Matrix Equalization
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Solution Overview
Problem
The Mura phenomenon in liquid crystal display panels, characterized by non-uniform display and black spots due to differences in spacer placement, affects image clarity, particularly noticeable in grayscale and white images due to human sensitivity to green light.
Innovation Solution
The liquid crystal display panel design includes a spacer layer with primary and secondary spacers, where the overlapping areas between black matrix elements and green sub-pixels are equalized to minimize visual brightness differences, addressing the Mura issue by ensuring uniformity across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If spacers are placed at different positions (primary and secondary spacers), then the liquid crystal layer thickness is maintained, but brightness non-uniformity (Mura phenomenon) occurs due to unequal overlapping areas with green sub-pixels
Solution Approach 1:
The patent applies local quality by making the black matrix elements have different lengths depending on their position: black matrix elements corresponding to primary spacers have a first length, while those corresponding to secondary spacers have a second length. This local differentiation compensates for the different overlapping areas with green sub-pixels, ensuring uniform brightness across the display panel while maintaining the spacer structure needed for liquid crystal layer thickness stability.
2Ease of manufacture
If black matrix elements are made uniform in size, then manufacturing is simplified, but brightness non-uniformity occurs due to varying overlapping areas with green sub-pixels at different spacer positions
Solution Approach 1:
The patent implements local quality by differentiating the dimensions of black matrix elements based on their specific positions relative to primary and secondary spacers. This approach prioritizes brightness uniformity over manufacturing simplicity, accepting that black matrix elements must be fabricated with varying lengths to compensate for the different overlapping areas with green sub-pixels.
Data Source
AI summary
A liquid crystal display panel and a display device are disclosed. The liquid crystal display panel includes an array substrate and an upper substrate arranged opposite to each other, and a liquid crystal layer, a spacer layer including primary spacers and secondary spacers, and a black matrix layer over the spacer layer. The overlapping area between one of the plurality of black matrix elements and a green sub-pixel near one of the plurality of primary spacers below said matrix element forms a first overlap area, wherein an overlapping area between one of the plurality of black matrix elements and a green sub-pixel near one of the plurality of secondary spacers below said matrix element forms a second overlap area; and the first overlap area equals the second overlap area.